If you are not sure, assume that an idea is not common knowledge and cite the source. It is much easier to remove a citation than it is to hunt down a citation and try to add it later. Finally, when in doubt, check with your professor.
Taking vitamin supplements will boost your energy level only if you are deficient in them. In particular, our bodies need B vitamins to release the energy in foods. The family of B vitamins includes B1, B2, B3, B5, B6, B7, B12 and folic acid. Taking large amounts won't give you extra energy, however, so it isn't wise to consume more than the recommended daily allowance.
Researchers have found that people who are B vitamin deficient may find themselves more sensitive to cold temperatures. B vitamins are considered the energy vitamins, because they play an important role in how your body converts food into energy. But their benefits don't stop there. B vitamins are also important for a healthy immune system, healthy red blood cell production, healthy digestion and a healthy nervous system.